Screw fan ventilator



July 28, 1936- J.. c. AKEsT R SCREW FAN VENTILATOR Filed Oct. 24, v1935 2 Sheets-Sheet 1 VI I I I I v I 4 I I I I P mam-Wm J. q. AKESTER SCREW FAN VENTILATOR July 28, 1935.

2 Sheets-Sheet 2 Filed Oct. 24, 1955 SCREW FAN VENTILATOR Joseph Cuthbert Akester, London, England, as-

signor to Winsor Ania Fans Limited, London.

England Application October 24, 1935, Serial No. 46,593 I In Great Britain January 29, 1935 .6 Claims. (01. 98-96) This invention relates to screw fan ventilators.

and its object is to devise a simple and cheap article of this kind, mainly intended for dwellings, oflices and shops, which can be readily fitted to apertures in windows and likepartitic'ns.

A screw fan ventilator according to the invention is characterized by an open-ended fan housing or easing made in two parts, of metal or-fsynthetic resinous composition or other suitable material, having complementary, externally flanged, screw-threaded spigot and socket portions adapted to be screwed. together with the marginal wall of an aperture in a window or like partitionbetween the flanges, one of the said parts having integral means, such as a spider or internal lugs, for supporting the fan screw drive motor.

Preferably the parts of the ventilator casing are formed with complementary, externally flanged, screw-threaded spigot and socket portions.

The blades of the fan screw, which may be constructed in accordance with the specification of British Patent No. 429,958, are conveniently formed integral with a hemi-spherical or conicocylindrical hub.

Further, the outer end of the casing adjacent the fan screw may be equipped with a hood or cowl which overlaps but is spaced from the said end, and the said hood or cowl may be inwardly curved to direct the air smoothly into or out of the casing accordingly as the fan is used as anair supply or air exhaust fan. The hood or cowl serves as a protection against the weather and also to reduce air noise. Instead of a hood or cowl, an adjustable louver may be provided.

By way of example, two constructional forms of screw fan ventilator in accordance with the invention are illustrated on the accompanying drawings.

Figure 1 represents a longitudinal section through the first of these forms.

Fig. 1a is a fragmentary end view of the hood or cowl hereinafter referred to.

Fig. 2 is an end view of the ventilator casing with the said hood or cowl and the fan screw and motor removed.

Fig. 3 is a longitudinal sectional elevation of the second illustrated form.

Fig. 4 is an end view corresponding to Fig. 3, but with the cowl or hood remoified.

Referring first to Figs. 1 and 2, the ventilator casing consists of two openz-ended cylindrical parts i, 2 moulded from synthetic resinous composition, said parts having, at their one end, compiementary screw-threaded spigot and socket portions 3, 4 and adjacent external flanges 5, 6 and one of said parts, namely the part I, also having an integral spider l for supporting the fan motor. The housing 8 of the fan motor is fitted into the hub of the spider I and secured thereto by set-screws 9 which pass through lugs ID of the motor housing into screw-threaded engagement with the spider. A cowl or hood II is fitted to the outer end of the other part 2 of the casing by means of screens I2 passing through apertured 1o bosses ii on the cowl into screw-threaded holes made in lugs l4 moulded with. the part 2.

The cowl ii overlaps but is spaced from the end of the casing part 2, and is inwardly curved for the purpose aforesaid. The blades l5 of'the l5 fan screw are formed integral with a hemispherical hub I 6 which is secured on the motor shaft ii and virtually forms a closure for one end of the motor housing 8.-

The various integers of the ventilator described can be mounted and fitted together and sold as a unit ready for installation. Installation is a simple matter, which requires no more than taking adrift the two parts I, 2 of the ventilator casing (without disturbing the mounting of th or the motor and fan screw) inserting the spigot portion 3 of the part I through the aperture in the window or partition l8 to which the ventilator is to be attached, and finally screwing on the other part 2 of the casing from the other side of window or partition. Manifestly, the marginal wall of the aperture will then be located between the two external flanges 5, 6 of the ventilator casing. If desired, felt or other packing l9 may the 30 be'interposed between the said flanges and the 35 said marginal wall of the aperture.

The construction illustrated by Figs. 3 and 4 'is very similar to that already described and illustrated by Figs. 1 and 2. In this case, however,

the part 2 of the ventilator casing is provided with 40 integral, spaced apart lugs Illa to which the motor housing 8 is secured by bolts 9a, said housing having integral radial arms Ia and the bolts passing through said arms and said lugs. A washer or distance piece 20 is shown interposed between the radial arms and the lugs. In this case also the cowl ii, instead of having integral bosses, is held in spaced relation with respect to the end of the ventilator casing by separate, tubular distance pieces or spacers l3a through which pass the bolts i2 that secure the cowl to the casing. Moreover, in this instance, the blades 15 of the fan screw are formed integral with a cameocylindrical hub secured to the motor shaft l1.

2! (Fig. i) denotes a terminalbox or socket, for

the electric current leads to the motor, moulded integrally with the casing part 2.

In both constructions the fan motor and fan screw areawholly contained within an open-ended, two-part ventilator casing, the air drawn in at one end passing about the motor housing and out of the casing at the other end.

I claim:--

1. A screw fan ventilator comprising, in combination, an open ended tubular casing constituted by two aligned parts having interengaglng screw threads at their adjacent ends, opposed external abutments on said parts to engage opposite sides of an apertured supporting partition about said aperture,an electric motor, means integral with one of said casing parts supporting the motor within said casing, and a fan screw mounted within said casing on the shaft of said motor.

2. A screw fan ventilator comprising, in combination, an open ended tubular casing made in two complementary parts, an internally screwthreaded socket on one end of one of said casing parts, a complementary externally screw-threadpresenting opposed surfaces to engage opposite sides of an apertured partition about the aperture, an electric motor, an internal spider integral with one of said casing parts for supporting the motor within said casing, and a fan screw mount- 5 threaded socket on one end of one of the casing parts, a complementary externally screw threaded spigot on the adjacent end of the other casing part, an external flange about said socket, an external flange adjacent said spigot, said flanges presenting opposed surfaces to engage opposite sides of an apertured partition about the aperture, an electric motor, spaced internal lugs on one of said casing parts, a housing for the motor supported by said lugs, and a fan screw mounted within said casing on the shaft of said motor.

4. A screw fan ventilator according to claim 1, including a cowl secured to one end of said casing. 5. A screw fan ventilator according to claim 2,

I including a cowl secured to one end of said casing.

6. A screw fan ventilator according to claim 3,

including a cowl secured to one end of said casing.

JOSEl=H CU'IHBERT AKESTER. 

